Need some opinions/ advice from some of you "gun hands"

67Dart273 said

Thanks you guys. The way I work, "this may take awhile." When I said buy, I should have been more clear--I mean an off the shelf used (probably not new) commercially manufactured rifle. Not a DIY deal, although I guess I could leave the lower with the seller, or destroy it, and then do my own lower.

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There are a number of manufacturers that are producing decent pieces. The grail used to be the sub-$1k AR. Not sure if that's the case any longer. Like everything else, it will depend on what you're intent is for use. Barrel length, type optics, bolt, gas tube, furniture etc will drive price. Old school long barrel, full stock M16 with carrying handle, M4 or precision rig.
Can't say I've often if ever seen an AR in the Used rack

The usual manufacturers will provide your high-end arm. Some of the best lesser known brands like Del-Ton are quality entry pieces. Lots of info out there on the interwebs.

Good luck.